Fix UnitNormMap transformation of the centre #3
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Modify UnitNormMap to transform the centre properly, and in a way that round trips: - In the forward direction transform centre to [AST__BAD, ..., AST__BAD, 0] (since the components of the unit vector are unknown, but the norm is 0) - In the inverse direction transform [any_value, ..., any_value, 0] to [0, ..., 0] Formerly UnitNormMap transform input = centre to [AST__BAD, ..., AST__BAD], which was incorrect and did not round trip.
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Modify UnitNormMap to transform the centre properly, and in a way that round trips:
(since the components of the unit vector are unknown, but the norm is 0)
Formerly UnitNormMap transform input = centre to [AST__BAD, ..., AST__BAD],
which was incorrect and did not round trip.